Taidnapam is a great place to bring your kids. There are some great spots to camp on both sides. The bathrooms are kept clean and super warm in the winter. The camp hosts are always very kind and drive by to offer firewood. My kids think it is the best place. They can ride their bikes, play at the park, and see lots of wildlife. Our only complaint would be the water levels being low. The swimming area is non existent.
This campground is a strange hidden gem - stick with me through the downsides. Taidnapam is on Riffe Lake, which is created by a dam and as of about 2013 the water levels have been permanently lowered by 30-ish feet. This is bad news for people who only went there for boating and fishing and swimming in the swim area but for some of us it's actually good news.
The campground is slower than it used to be during the summer months due to the lowered water levels - but that means you can often still get a reservation at the last minute, especially for the walk-in tent sites (which is what we use). We have camped for three years now at the walk-in tent sites and it's a bit tougher to access the water but you definitely can still find plenty of places to get in or take a kayak down to the water. There's also lots of fun areas around the edge of the lake to explore that used to be under water - making for interested hiking.
We love this campground to go to with kids - the walk-in tent sites are great and the water is so shallow now for quite a ways out so the kids can play in the water and the sand/mud along the edge of the lake. There are so many nooks and crannies around the edge of the lake to explore with the kids - and we used an inflatable kayak while there to go across the lake. They also have a scavenger hunt of items hidden around the campground that you can do with your kids (or if they are a bit older they can do on their own) and a playground.
Decent coin op showers. Nice walk in tent sites. Nice RV sites. Decent playground. Fishing bridge just a short walk. There's no store or anything. Can buy firewood nearby. Flush toilets. Cleaned regularly.